Once again, Theory Thursday brings us to a food experiment. We started with cups of Mountain Dew (you can use any "clear" pop) and dropped in craisins. Jake expected the craisin to sink, but was surprised to see it rise again. When added, the craisin sinks to the bottom. There, bubbles form on it causing it to float to the surface where the bubbles pop. The craisin sinks again and the process continues.
The video takes place a minute or so into the experiment. Sorry about the static sound!